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Related Experiment Videos

A structural model for the rolA protein and its interaction with DNA.

D J Rigden1, M Carneiro

  • 1National Centre of Genetic Resources and Biotechnology, Cenargen/Embrapa, Brasilia, Brazil. daniel@cenargen.embrapa.br

Proteins
|January 29, 2000
PubMed
Summary

Structural analysis reveals the plant oncogene rolA adopts a known protein fold, similar to papillomavirus E2. This finding aids in understanding rolA

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Area of Science:

  • Structural biology
  • Plant molecular biology
  • Oncogene research

Background:

  • The plant oncogene rolA's function is poorly understood due to limited structural data.
  • Lack of significant sequence similarity hinders traditional structure prediction methods.

Purpose of the Study:

  • To determine the three-dimensional structure of the plant oncogene rolA.
  • To identify potential DNA-binding capabilities and mechanisms of rolA.

Main Methods:

  • Utilized protein threading programs incorporating predicted secondary structure to identify homologous folds.
  • Developed a structural model for rolA through alignment corrections and iterative evaluation.
  • Assessed model quality using protein structure verification tools.

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Main Results:

  • The rolA sequence adopts the fold of the papillomavirus E2 DNA-binding domain, despite low sequence identity.
  • A reliable structural model of rolA was generated, predicting a dimeric state and DNA-binding capacity.
  • Specific residues (Lys 24, Arg 27) are predicted to mediate sequence-specific DNA interactions.

Conclusions:

  • The plant oncogene rolA shares a conserved structural fold with viral proteins, suggesting functional convergence.
  • The structural model provides insights into rolA's dimeric nature and DNA-binding mechanism.
  • This study overcomes previous limitations in rolA structural determination, paving the way for further functional studies.